Source: Tafsir al-Ahlam al-Kabir (Ibn Sirin)
Whoever sees himself marry a dead woman and consummates the marriage will attain a hopeless matter. If he does not consummate it, he is striving for a dead matter that will not be completed. A woman marrying a dead man indicates the scattering of her family and her impoverishment.
Source: Ta'tir al-Anam fi Ta'bir al-Manam (Al-Nabulsi)
The marriage of the dead in a dream indicates comfort and joy for their family. Whoever sees that a dead person got married, it indicates their good state with Allah Almighty.
Source: Al-Isharat fi Ilm al-Ibarat (Ibn Shahin)
Whoever sees himself marry a dead woman will triumph in a matter he had despaired of. If the woman is unknown, he will die.